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Java Queries
Complete java interview questions library
Feb
2008
What is the difference between yielding and sleeping?
When a task invokes its yield() method, it returns to the ready state. When a task invokes its sleep() method, it returns to the waiting state.
Feb
2008
How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8
Unicode requires 16 bits and ASCII require 7 bits. Although the ASCII character set uses only 7 bits, it is usually represented as 8 bits. UTF-8 represents characters using 8, 16, and 18 bit patterns. UTF-16 uses 16-bit and larger bit patterns.
Feb
2008
What is the difference between the >> and >>> operators?
The >> operator carries the sign bit when shifting right. The >>> zero-fills bits that have been shifted out.
Feb
2008
What is an Iterator interface?
The Iterator interface is used to step through the elements of a Collection.
Feb
2008
What modifiers may be used with an inner class that is a member of an outer class?
A (non-local) inner class may be declared as public, protected, private, static, final, or abstract.
Feb
2008
What is the Vector class?
The Vector class provides the capability to implement a growable array of objects
Feb
2008
How does Java handle integer overflows and underflows?
It uses those low order bytes of the result that can fit into the size of the type allowed by the operation.
Feb
2008
What is the List interface?
The List interface provides support for ordered collections of objects.
Feb
2008
Which characters may be used as the second character of an identifier, but not as the first character of an identifier?
The digits 0 through 9 may not be used as the first character of an identifier but they may be used after the first character of an identifier.
Feb
2008
What is the Collections API?
The Collections API is a set of classes and interfaces that support operations on collections of objects.
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